NSIS

NSIS, aka Nullsoft Software Install Script, is a programming language created in 2001.

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Nullsoft Scriptable Install System (NSIS) is a script-driven installer authoring tool for Microsoft Windows with minimal overhead backed by Nullsoft, the creators of Winamp. NSIS is released under a combination of free software licenses, primarily the zlib license. It has become a widely used alternative to commercial proprietary products like InstallShield, with users including Amazon.com, Dropbox, Ubisoft, FL Studio, BitTorrent, and McAfee.. Read more on Wikipedia...

NSIS website
NSIS Wikipedia page
There are at least 4,747 NSIS repos on GitHub
NSIS first developed in Nullsoft, Inc
file extensions for NSIS include nsi and nsh
NSIS on Twitter
The Google BigQuery Public Dataset GitHub snapshot shows 7k users using NSIS in 8k repos on GitHub
Explore NSIS snippets on Rosetta Code
NSIS appears in the TIOBE Index
CodeMirror package for syntax highlighting NSIS
Pygments supports syntax highlighting for NSIS
GitHub supports syntax highlighting for NSIS
See also: (5 related languages)C, Eclipse, Delphi, Visual Studio, Python

Example from the Hello World Collection:

; Hello World in Nullsoft Software Install Script (NSIS)

Caption "Hello World!"
OutFile ".\HelloWorld.exe"
SilentInstall silent

Section ""
        MessageBox MB_OK "Hello World!"
SectionEnd

Example from Linguist:

; ---------------------
;       x64.nsh
; ---------------------
;
; A few simple macros to handle installations on x64 machines.
;
; RunningX64 checks if the installer is running on x64.
;
;   ${If} ${RunningX64}
;     MessageBox MB_OK "running on x64"
;   ${EndIf}
;
; DisableX64FSRedirection disables file system redirection.
; EnableX64FSRedirection enables file system redirection.
;
;   SetOutPath $SYSDIR
;   ${DisableX64FSRedirection}
;   File some.dll # extracts to C:\Windows\System32
;   ${EnableX64FSRedirection}
;   File some.dll # extracts to C:\Windows\SysWOW64
;

!ifndef ___X64__NSH___
!define ___X64__NSH___

!include LogicLib.nsh

!macro _RunningX64 _a _b _t _f
  !insertmacro _LOGICLIB_TEMP
  System::Call kernel32::GetCurrentProcess()i.s
  System::Call kernel32::IsWow64Process(is,*i.s)
  Pop $_LOGICLIB_TEMP
  !insertmacro _!= $_LOGICLIB_TEMP 0 `${_t}` `${_f}`
!macroend

!define RunningX64 `"" RunningX64 ""`

!macro DisableX64FSRedirection

  System::Call kernel32::Wow64EnableWow64FsRedirection(i0)

!macroend

!define DisableX64FSRedirection "!insertmacro DisableX64FSRedirection"

!macro EnableX64FSRedirection

  System::Call kernel32::Wow64EnableWow64FsRedirection(i1)

!macroend

!define EnableX64FSRedirection "!insertmacro EnableX64FSRedirection"

!endif # !___X64__NSH___

Example from Wikipedia:

# Modern UI example script
!include MUI.nsh
Name "Example 2"
OutFile "Example2.exe"
!insertmacro MUI_PAGE_WELCOME
!insertmacro MUI_PAGE_LICENSE "license.rtf"
!insertmacro MUI_PAGE_DIRECTORY
!insertmacro MUI_PAGE_COMPONENTS
!insertmacro MUI_PAGE_INSTFILES
!insertmacro MUI_PAGE_FINISH
!insertmacro MUI_LANGUAGE "English"
!insertmacro MUI_LANGUAGE "German"
!insertmacro MUI_LANGUAGE "French"
Section "Extract makensis"
  SetOutPath $INSTDIR
  File ..\makensis.exe
SectionEnd

Feature	Supported	Token	Example
Line Comments	✓	;	; A comment
Comments	✓
Semantic Indentation	X

NSIS - Programming language

Language features